Drying device for skeins of yarn



Feb. 2, 1954 KROPF DRYING DEVICE-FOR SKEINS OF YARN Filed Nov. 21, 1950 Fig. 3

mm k i Patented Feb. 2, 1954 DRYING DEVICE FOR SKEINS OF YARN Emil Kropf, Bayreuth, Germany,

Fleissner & Sohn, Ma

Germany assignor to H.

schinenfabrik, Bayreuth,

Application November 21, 1950, Serial N 0. 196,749

Claims priority, application Germany November 23, 1949 2 Claims.

The invention relates to a device serving for drying skeins of yarn and provided with rotating carrying rods supporting the skeins of yarn and moving through the drying chamber.

In known drying devices of that kind the carrying rods are moved through the drying chamber by means of chains. Such conveying chains, however, are troublesome as they are flexible and they sag; it has been suggested, therefore, to provide the carrying rods at their ends with toothed wheels meshing with racks. The carrying rods are moved thereby in a forward direction as well as rotated around their axes. The skeins of yarn hanging on the carrying rods move therefore in such a way that the skeins move in a vertical direction. Thereby the advantage is obtained that the skeins continuously alter their position on the carrying rods while in the first mentioned construction moisture is gathered in the lower portions of the yarn in an increased degree. It is however disadvantageous that the opposite layers of two skeins hanging on adjacent carrying rods move in opposite directions. While the one run of a skein moves downwardly the neighbouring skein moves upwardly. Therefore, it happens now and againespecially if the rods are arranged in a relatively short distance from each other-that the threads of two neighbouring skeins become entangled whereby the skeins disturbances arise.

According to one feature of the invention these disadvantages are avoided by causing each carrying rod to rotate in a direction opposite to the direction of rotation of the next carrying rod so that the opposite runs of the skeins hanging on adjacent carrying rods move in the same direction. In other words, the runs of the skeins move side by side from above to below or from below to above, however, at no time do adjacent runs move in opposite directions whereby the danger of becoming entangled is reliably avoided.

According to another feature of the invention the carrying rods are provided at their ends with driving elements such as friction discs, toothed wheels or the like rolling along counterdriving means such as friction rollers, toothed racks or the like in such a way that each carrying rod rotates in a direction opposite to the rotating direction of the adjacent rod. Preferably the driving elements of adjacent carrying rods engage each other simultaneously.

According to a further feature of the invention the ends of the carrying rods, actuated by a force acting in the moving direction, roll along of yarn are disarranged and ill guiding bars and drive each other by means of friction discs arranged on said rods and engaging each other. The carrying rods may be staggered relatively to each other in such a way that the series of carrying rods consisting of the first, the third, the fifth and so on carrying rod is arranged in a higher position than the other series consisting of the second, fourth, sixth and so on carrying rod.

The invention has not only the advantage that the danger of the skeins becoming entangled or disarranged is avoided but also the further advantage that in consequence of this danger being avoided the carrying rods may be brought nearer to each other and therefore a greater number of carrying rods may be arranged within a certain length by the device. In consequence thereof a greater number of skeins of yarn may be simultaneously dried and the drying device according to the invention has a greater capacity. In this sense it is also of importance that the carrying rods are arranged alternately in different levels as also thereby a greater number of rods may be provided within a certain length or, with the same number rods, the length of the device may be diminished.

Besides, a further advantage of the invention lies in the fact, that separate driving means for rotating the carrying rods may be dispensed with as the rods drive one another by the engagement of their friction discs. In this way the construction of the drying device is essentially simplified.

According to still another feature of the invention a sp-eediest possible and complete drying of skeins of yarn is attained thereby that'the carrying rods are provided with a perforated surface allowing the passage of the drying air flowing generally from above to below. For this purpose carrying rods may be used consisting of perforated tubes. It is however of special advantage to form each carrying rod of a plurality of spaced bars arranged parallel to each other and allowing the drying air to pass between them.

The drawing shows schematically an embodiment of the invention by way of example.

Fig. 1 is a side view of a drying device according to the invention.

Fig. 2 is a. cross section through Fig. 1 on an enlarged scale and Fig. 3 shows a part of a carrying rod formed of parallel bars.

The carrying rods conveying the skeins of yarn hanging thereon through the drying chamber are divided into two series, the upper one consisting of the rods a a a a" and so on while the lower series consists of the rods (1 a a a and so on. The two series are staggered relatively to each other and thereby are arranged in different levels.

The carrying rods are provided at their ends with discs b, the discs of adjacent rods engaging each other so that all rods of the upper series rotate in a counterclockwise direction if the rods of the lower series rotate in the clockwise direction. In consequence thereof the threads of the skeins c hanging down from the carrying rods run from below to above or vice versa so that two portions of the skeins lying side by side move in the same direction.

The carrying rods are guided during their passage through the drying chamber by means of two opposite arranged guiding bars at of approximately U-shaped cross section. The rods of the lower series may roll along the lower guiding truck a while the rods of the upper series roll along the upper guiding track I.

In the shown embodiment therefore the carrying rods roll along the appertaining guiding tracks as well as along each other and for that purpose the friction discs I) are provided.

Naturally the idea of the invention may also be realized in another way, for instance, by means of toothed wheels and racks. Further it is not necessary that the rods of the upper series roll along the guiding track 1. It is also possible to have these rods roll along the middle web it of the guiding bars 11 by means of pivots g (Fig. 2), said web preventing the rods of the lower series to simultaneously alter their position in the vertical direction disadvantageously.

In consequence of the fact that the discs I) are influenced by a force P acting in the moving direction all discs are pressed against each other and simultaneously against the respective guiding track. This efiect may be increased if a suitable counterforce Q is provided on the exit end of the chamber.

The carrying rods shown in the embodiment according to Figs. 1 and. 2 are formed of tubes provided with a plurality of holes i; therefore, the air may pass and the drying air which usually moves downwardly in the direction or the arrows x may flow through the carrying rods thereby intensely acting on the skeins of yarn.

This is of special importance as, according to the invention, the rods may be brought together so far that the skeins of yarn nearly touch each other and therefore the flowing heated air cannot sufiiciently flow between the rods provided with the yarn. For this reason it is very advantageous that, according to the invention, the heated air does flow not only between the rods but also through them and thereby through the yarn hanging on these rods.

It is not absolutely necessary to use perforated carrying rods when operating according to the invention, as it is also possible to employ carrying rods as shown in Fig. 3 each consisting of a plurality of parallel spaced bars 70. In the embodiment according to Fig. 3 three bars form one carrying rod. The drying air may flow between these bars over the whole length of the bars. 7

Having thus particularly described the nature of my said invention and the manner inwhich the same is to be performed what I wish to have covered by Letters Patent is:

l. A drying device for skeins of yarn comprising a plurality of rotating carrying rods arranged adjacent each other to guide the skeins of yarn during the drying of the yarn and being divided into a pair of series of rods staggered relatively to each other, friction discs provided on the opposite ends of each of said carrying rods, a pair of guiding tracks arranged in two difierent levels, the friction discs of each series of varrying rods rolling along its respective track and said rods being adapted to move along said tracks to thereby press saiddiscs against each other to rotate each of said rods in a direction opposite to the rotating direction of the adjacent carrying rod.

2. A drying device for skeins of yarn comprising a plurality of rotating carrying rods ar--- ranged adjacent each other to guide the skeins of yarn during the drying of the yarnand being divided into two series of rods staggered" relatively to each other, frictiondiscs providedv on the opposite ends of each of said. carrying rods, a pair of guiding tracks of U-shaped cross secs tion one above the other, the friction discs of the one series of carrying rods rolling along the lower track and the other series of carrying rods rolling along the upper track of said U-shaped tracks and said rods being adapted to move along said tracks and to press against each other to rotate each of said rods in a direction opposite to the rotating direction of the adjacent carrying rod.

E'MIL KROPF.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 508,094 Duckworth Nov. '7 1893 1,494,307 Hinnekens May 13', 1924 1,529,202 Miller Mar. 10, 1925 1,836,086 Perl Dec. 15,. 1931 2,468,892 OKeeffe May 3, 1949 FOREIGN PATENTS Number Country Date 2,694 Great Britain A. D. 1856 

